<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>CSS三角强化的巧妙运用</title>
    <style>
      .box1 {
        width: 0;
        height: 0;
        /* 把上边框宽度调大 */
        /* border-top: 100px solid transparent;
            border-right: 50px solid skyblue; */
        /* 左边和下边的边框宽度设置为0 */
        /* border-bottom: 0 solid blue;
            border-left: 0 solid green; */

        /* 直角三角形 */
        /* 1.只保留右边的边框有颜色 */
        border-color: transparent red transparent transparent;
        /* 2. 样式都是solid */
        border-style: solid;
        /* 3. 上边框宽度要大，右边框宽度稍小，其余的边框该为0 */
        border-width: 100px 50px 0 0;
      }
      .price {
        width: 160px;
        height: 24px;
        line-height: 24px;
        border: 1px solid red;
        margin: 0 auto;
      }
      .miaosha {
        position: relative;
        float: left;
        width: 90px;
        height: 100%;
        background-color: red;
        text-align: center;
        color: #fff;
        font-weight: 700;
        margin-right: 8px;
      }
      /* 直角三角形，然后定位到右侧即可 */
      .miaosha i {
        position: absolute;
        right: 0;
        top: 0;
        width: 0;
        height: 0;
        border-color: transparent #fff transparent transparent;
        border-style: solid;
        border-width: 24px 10px 0 0;
      }
      .origin {
        font-size: 12px;
        color: gray;
        text-decoration: line-through;
      }
    </style>
  </head>
  <body>
    <div class="box1"></div>
    <div class="price">
      <span class="miaosha">
        ¥1650
        <i></i>
      </span>
      <span class="origin">¥5650</span>
    </div>
  </body>
</html>
